[TASK] Styling of Page module

Overwork the styling of the Page module:

* New style for columns
* Hide new icons by default, show on hover
* Style Drag & Drop

Thanks to Lars Zimmermann and Jens Hoffmann

Change-Id: I7f06382c51561e8c9855af0ef15afea1a8dd6acb
Resolves: #43208
Releases: 6.0
Reviewed-on: http://review.typo3.org/16700
Reviewed-by: Steffen Gebert
Tested-by: Steffen Gebert
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel